Study On Anti-penetration Mechanism Of Graphene Reinforced Composites

In this paper,the graphene-reinforced aluminum-based SiC composite armored board produced by Beijing Institute of Aeronautical Materials Research is taken as the research object.The basic mechanics tests of static mechanical test and dynamic mechanical test(SHPB)of the graphene reinforced aluminum-based SiC composite are carried out.The mechanical properties of graphene-reinforced aluminum-based SiC composites under static and dynamic test loading conditions were studied and the stress-strain curves at different strain rates were obtained.By comparing the microstructure of the specimen before and after the mechanical test,and conducting the ballistic gun test,the failure mechanism of the graphene reinforced aluminum-based SiC composite under the anti-penetration action was studied.Through parameter fitting of mechanical test data,numerical simulation is carried out to compare with test results.The stress-strain relationship of the material from 0.001 / s strain rate to high strain rate of 2200 / s to 5200 / s was obtained by fitting the graphene-reinforced aluminum-based SiC composites under static compression test and SHPB test.Johnson-Cook(JC)constitutive model parameters and Cower-Symonds(CS)constitutive model parameters of graphene reinforced Al-based SiC composites were investigated.Ballistic gun test on graphene reinforced aluminum-based SiC composite composite armor plate.The use of high strength steel fragments of the target penetration test at different speeds to get the target plate in the form of damage under high-speed penetration.The micro-morphology analysis shows that graphene enhances the main microscopic fracture mechanism of Al-based Si C composites under strong and micro conditions: the Al matrix undergoes a strong plastic deformation,and the SiC particles refine with the flow of plastic bands,resulting in the formation of aluminum matrix and Si C ceramic particles Interface is separated.The experimental results of the ballistic gun are validated by using the explicit finite element analysis software AUTODYN.The simulation results show that: 1)the failure modeof graphene reinforced Al-SiC composite sheet increases sharply with the increase of fragment impact velocity;2)The thickness of aluminum-based SiC composite plate increases,which shows a significant thickness advantage;3)When the fragments penetrate the target plate,when the remaining thickness of the target plate is less than 25 mm,a tapering 45 °conical deformation area is formed.When the deformation area ruptures Obvious cracks,the fragments can penetrate the target plate,indicating that the target plate has a significant thickness advantage;Simulation calculated 43 mm target ballistic limit of about 985 m / s,and ballistic gun test 43 mm target ballistic limit About 957.52 m / s ~ 1075.37 m / s interval error range: 3%-8.4%.